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Elaboration of novel sulfate based positive electrode materials for Li-ion batteries

Abstract : The increasing demand of our society for Li-ion batteries calls for the development of positive electrode materials, with specific requirements in terms of energy density, cost, and sustainability. In such a context, we explored four sulfate based compounds: a fluorosulfate – LiCuSO4F, and a family of oxysulfates – Fe2O(SO4)2, Li2Cu2O(SO4)2 and Li2VO(SO4)2. Herein their synthesis, structure, and electrochemical performances are presented for the first time. Being electrochemically inactive, LiCuSO4F displays an ordered triplite structure which is distinct from other fluorosulfates. The electrochemical activity of the oxysulfate compounds was explored towards lithium. Specifically, Fe2O(SO4)2 delivers a sustained reversible capacity of about 125 mA∙h/g at 3.0 V vs. Li+/Li0; Li2VO(SO4)2 and Li2Cu2O(SO4)2 respectively exhibit the highest potential of 4.7 V vs. Li+/Li0 among V- and Cu- based compounds. Last but not least, the Li2Cu2O(SO4)2 phase reveals the possibility of anionic electrochemical activity in a polyanionic positive electrode. Their physical properties, such as ionic conductivities and magnetic properties are also reported. Overall, this makes oxysulfates interesting to study as polyanionic positive electrodes for Li-ion batteries.
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https://tel.archives-ouvertes.fr/tel-01661440
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Submitted on : Tuesday, December 12, 2017 - 12:05:40 AM
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  • HAL Id : tel-01661440, version 1

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Meiling Sun. Elaboration of novel sulfate based positive electrode materials for Li-ion batteries. Other. Université Pierre et Marie Curie - Paris VI, 2016. English. ⟨NNT : 2016PA066686⟩. ⟨tel-01661440⟩

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